I'm afraid currently there is no option to pause your store free of charge. The cost of pausing a store is for $14 per month. This is to maintain the details of your store!
Alternatively, if you don't pay your subscription fee, we cannot guarantee that your store will not depreciate.
If there is anything else we can help you with, please let us know, we're happy to help!
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The reason your collection might not be relfected on your site could be that there's nothing linking to the collection. For example in your navigation the collection that is being linked is 'collections/all', if you want your collection to show up on the navigation you just need to simply add it. You can test to see that your collection is active by opening the collection on the admin end and clicking "View". That should bring up the page containing your collection.
In Shopify your categories are basically your collections so as far as building those categories there are a lot of ways to do this. One of the easiest ways (if the theme allows this) is using a nested menu in your navigation that would contain links to the collections for your categories. Example layout: Shop > Mens > T-Shirts. In the example below you have Bed & Bath > Bedding > Duvet Covers, Pillow Shams, Bed Runners.
Another way to do this is to build a page similar to your all collections page and turn that into the "categories" you desire. For example, this shop built this page with thumbnails and icons at the top of the page showing the product categories/collections. You can build a page containing thumbnails for men and women and have them link to another page that contains thumbnails for t-shirts, pants, etc that link to their respective collections.
Adding these to the actual product page could be a little tricky and since the option is not already available in Brooklyn you would need to custom code that into there with link lists or a list of thumbnails pointing to respective collections. You could also use location based breadcrumbs like in the image below.
I hope this helps!
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